D11981: [Image Wallpaper] Fix blur

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, davidedmundson.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  This broke in the transition to `StackView` as the blur needs a full-size source. Additionally
  
  - put the item into a `Loader` to avoid needless shader compilation  and other work
  - only load the blur for image fill modes where the image does not cover the full size
  - don't render background color when blur is enabled as you cannot see it anyway

TEST PLAN
  - Enabled and disabled blur, verified that the Loader loads and unloads
  - Switched between fill modes, verified that the Loader loads and unloads
  - Verified that blur renders correctly and looks nice

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D11981

AFFECTED FILES
  wallpapers/image/imagepackage/contents/ui/main.qml

To: broulik, #plasma, davidedmundson
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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